snd_hda on Optiplex 980

Jonathan Chen jonathan.chen at
Thu Nov 25 19:24:51 UTC 2010

On 26/11/2010 08:19, Doug Barton wrote:
> On 11/25/2010 11:12, Jonathan Chen wrote:
>> Thanks for the hint here. I've just tried out pcm4 and pcm5 and they
>> work fine. It's a bit of a reach for my headphone-jack, but I'm really
>> glad to have something working now.
> I have a 960 (thanks to the generosity of a user) and was recently given
> the hint to add hw.snd.default_unit=1 to /etc/sysctl.conf so that the front
> jacks are operational instead of the back. For your situation I'm guessing
> that instead of 1 you would use (number-of-working-rear-jack + 1). You can
> change it with sysctl on the command line, and when you get a working setup
> add it to /etc/sysctl.conf.

I've got hw.snd.default_unit=5 for the 980, as pcm4 only activates the 
internal speaker. The back-panel jack (and the front-panel, as it appears) 
is hooked up to pcm5.

Jonathan Chen <jonathan.chen at>
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